I would like to suggest this book if you want to get started with MongoDB document oriented storage engine and Pentaho Open Source BI suite.

Target Audience
This book is intended for business analysts, data architects, and developers new
to either Pentaho or MongoDB, who want to be able to deliver a complete solution
for storing, processing, and visualizing data. It’s assumed that you already have
experience in defining the data requirements needed to support business processes
and exposure to database modeling, SQL query, and reporting techniques.

Rating: 8 out of 10

Chapter 1, Getting Started with Pentaho and MongoDB, introduces you to the powerful combination of MongoDB and Pentaho and provides step-by-step guidance on how to install and configure both technologies and restore the sample MongoDB data provided with this book.Chapter 2, MongoDB Database Fundamentals, expands on the topic of data modeling and explains MongoDB database concepts essential to querying MongoDB data with Pentaho.Chapter 3, Using Pentaho Instaview, shows you how to visualize data by connecting Pentaho to MongoDB. You use Instaview with the sample MongoDB database to analyze and visualize the website clickstream data.Chapter 4, Modifying and Enhancing Instaview Transformations, introduces Pentaho Data Integration (PDI)—the ETL tool used by Instaview to extract, load, and transform data from various data sources.Chapter 5, Modifying and Enhancing Instaview Metadata, explores metadata by explaining dimensional modeling concepts and how to model metadata to better reflect business requirements.Chapter 6, Pentaho Report Designer Fundamentals, teaches you the basics of Pentaho Report Designer (PRD) to build pixel-perfect reports sourced directly from MongoDB databases.Chapter 7, Pentaho Report Designer Prompting and Charting, expands on the previous chapter by teaching you additional advanced PRD features. You can enhance your report with new queries, charts, and a prompt designed to make the report more interactive.Chapter 8, Deploying Pentaho Analytics to the Web, is all about web-enabling your MongoDB data using Pentaho methods and web interfaces for connecting to, modeling, and analyzing our sample clickstream data in a web browser.